Abstract: The present invention aims to detect breakage of a sieve in real-time and thus substantially reduce a cost increase of products caused by sieve breakage. The present invention also aims to reduce management cost of a sieve substantially. Multiple conductive bands 40 through 51 of a predetermined width, composed of multiple (for example, ten, in the structure shown in the figures) conductive weaving threads 24 and multiple (for example, ten) nonconductive weaving threads 23 and a certain number of nonconductive weaving threads 25, are formed in one area of the screen member 5. These conductive bands 40 through 51 of combined weave are formed parallel to the axial direction X at certain intervals D. Between each conductive band 40 through 51, nonconductive bands 52 through 62 plane-woven by using the nonconductive weaving threads 23 and the nonconductive weaving threads 25 are formed. A continuous conductive element 82 of a folded shape is formed, as shown in FIGS.